The prince of Wales and the Duchess of Cornwall try to board the Harry Potter inspired Hogwarts Express, at the fictional Platform of 9 and three quaters, during a tour with the Prince of Wales around the refurbished King’s Cross train Station, during a visit to the terminal in central London.

The prince of Wales and the Duchess of Cornwall try to board the Harry Potter inspired Hogwarts Express, at the fictional Platform of 9 and three quaters, during a tour with the Prince of Wales around the refurbished King's Cross train Station, during a visit to the terminal in central London.

The Duchess of Cornwall and The Prince of Wales travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Duchess of Cornwall and The Prince of Wales travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Prince of Wales and the Duchess of Cornwall study a model of the refurbished King’s Cross train Station, during a visit to the terminal in central London.

The Prince of Wales and the Duchess of Cornwall study a model of the refurbished King's Cross train Station, during a visit to the terminal in central London.

The Prince of Wales and The Duchess of Cornwall walk through a ticket gate as they prepare to travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Prince of Wales and The Duchess of Cornwall walk through a ticket gate as they prepare to travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Prince of Wales and the Duchess of Cornwall study a model of the refurbished King’s Cross train Station, during a visit to the terminal in central London.

The Prince of Wales and the Duchess of Cornwall study a model of the refurbished King's Cross train Station, during a visit to the terminal in central London.

The Prince of Wales and the Duchess of Cornwall study a model of the refurbished King’s Cross train Station, during a visit to the terminal in central London.

The Prince of Wales and the Duchess of Cornwall study a model of the refurbished King's Cross train Station, during a visit to the terminal in central London.

LONDON, ENGLAND – JANUARY 30: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall drink a punch made from a Victorian recipe during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK.

The Duchess of Cornwall and The Prince of Wales travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Duchess of Cornwall and The Prince of Wales travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Duchess of Cornwall and The Prince of Wales travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Duchess of Cornwall and The Prince of Wales, travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

The Duchess of Cornwall and The Prince of Wales, travel on a Metropolitan underground train from Farringdon to Kings Cross as they mark 150 years of London Underground.

LONDON, ENGLAND – JANUARY 30: Prince Charles, Prince of Wales (centre R) and Camilla, Duchess of Cornwall are served punch made from a Victorian recipe by General Manager Kevin Kelly (L) during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK.

LONDON, ENGLAND - JANUARY 30: Prince Charles, Prince of Wales (centre R) and Camilla, Duchess of Cornwall are served punch made from a Victorian recipe by General Manager Kevin Kelly (L) during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK. (Photo by Oli Scarff - WPA Pool/Getty Images)

LONDON, ENGLAND – JANUARY 30: Prince Charles, Prince of Wales (centre R) and Camilla, Duchess of Cornwall are served punch made from a Victorian recipe by General Manager Kevin Kelly (L) alongside hotel co-owner Harry Handelsman (R) during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK.

The Prince of Wales (centre) and The Duchess of Cornwall visit the recently regenerated St Pancras Renaissance London Hotel, adjacent to St Pancras International Station in London as they mark 150 years of London Underground.

LONDON, ENGLAND – JANUARY 30: 30: Prince Charles, Prince of Wales (L) and Camilla, Duchess of Cornwall (2nd L) view the grand staircase with General Manager Kevin Kelly (R) and Co-owners Harry Handelsman (2nd R) and Lord Stanley Fink (C) during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK.

LONDON, ENGLAND - JANUARY 30: 30: Prince Charles, Prince of Wales (L) and Camilla, Duchess of Cornwall (2nd L) view the grand staircase with General Manager Kevin Kelly (R) and Co-owners Harry Handelsman (2nd R) and Lord Stanley Fink (C) during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK. (Photo by Oli Scarff - WPA Pool/Getty Images)

LONDON, ENGLAND – JANUARY 30: 30: Prince Charles, Prince of Wales (L) laughs as Camilla, Duchess of Cornwall signs the visitors’ book as ith General Manager Kevin Kelly (R) looks on during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK.

LONDON, ENGLAND - JANUARY 30: 30: Prince Charles, Prince of Wales (L) laughs as Camilla, Duchess of Cornwall signs the visitors' book as ith General Manager Kevin Kelly (R) looks on during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK. (Photo by Oli Scarff - WPA Pool/Getty Images)

LONDON, ENGLAND – JANUARY 30: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall view the grand staircase with Hotel Historian Royden Stock during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK.

LONDON, ENGLAND - JANUARY 30: Prince Charles, Prince of Wales and Camilla, Duchess of Cornwall view the grand staircase with Hotel Historian Royden Stock during a visit to the recently regenerated St Pancras Renaissance London Hotel adjacent to St Pancras International Station on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK. (Photo by Oli Scarff - WPA Pool/Getty Images)

LONDON, ENGLAND – JANUARY 30: 30: Prince Charles, Prince of Wales shares a joke with Kevin Kelly (C), General Manager of St Pancras Renaissance London Hotel as they admire the architecture of St Pancras International Station during a visit to St Pancras Renaissance London Hotel, adjacent to St Pancras International Station, on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK.

LONDON, ENGLAND - JANUARY 30: 30: Prince Charles, Prince of Wales shares a joke with Kevin Kelly (C), General Manager of St Pancras Renaissance London Hotel as they admire the architecture of St Pancras International Station during a visit to St Pancras Renaissance London Hotel, adjacent to St Pancras International Station, on January 30, 2013 in London, England. The Prince of Wales and The Duchess of Cornwall are marking the 150th anniversary of London Underground to emphasise the importance of engineering and infrastructure development in the UK. (Photo by Oli Scarff - WPA Pool/Getty Images)